I'm according with Derek, but I saw you have a mix of languages and 
method, spanish and english, I'm speak spanish too, but as a best practice 
and prevent mix langagues try to use english, you know is like a standard 
or best practice in latin America

El lunes, 26 de abril de 2021 a las 0:18:20 UTC-6, Derek escribió:

> I think you have used the wrong name - "saveit" instead of "save" - also 
> have a look at the example in the docs:
>
> https://docs.djangoproject.com/en/3.2/topics/db/models/#overriding-predefined-model-methods
> and see which parameters are needed for it.
>
> On Saturday, 24 April 2021 at 20:50:15 UTC+2 encinas...@gmail.com wrote:
>
>> Hi everyone i build a web application in Django 3.1.7 and i try to do the 
>> next opeation(multiplication).
>>
>> in my models a have:
>> class Articles(models.Model):
>>      quantity = models.PositiveIntegerField()
>>     cost_buy = models.DecimalField(max_digits=10, decimal_places=2)
>>     total_todo = models.DecimalField(max_digits=10, decimal_places=3)
>>
>> @property
>> def total_valores(self):
>>      return (self.cost_buy*self.quantity)
>>
>> def saveit(self):
>>     self.total_todo = self.total_valores
>>     super (Articles, self).save()
>> __________________________________________________________
>>
>> so, I was tried with this functions , but it's doesn't save anything
>>
>> would you give me some recomendations.
>>
>> Thank you very much in advance and I remain at your service regards 
>>
>

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